Question

Factorise (a+b+1)²-4(a+b)-25
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Answer 1

Answer:

25 (a+b)2 -16 (a-b)2

52 (a+b)2 -42(a-b)2

(5 (a+b))2 - (4(a-b))2

(5a+5b)2 - (4a- 4b)2

((5a+5b )+ (4a-4b)) ((5a+5b )-(4a-4b))

(5a+5b + 4a-4b) (5a+5b -4a+4b)

(9a+ b) (a+9b)